code: def test_bfs_identity_search_xfail():
      s = PhaseGate(0)
      t = TGate(0)
      gate_list = [Dagger(s), t]
      id_set = {GateIdentity(Dagger(s), t, t)}
      assert bfs_identity_search(gate_list, 1, max_depth=3) == id_set
  
file_path: sympy/sympy/physics/quantum/tests/test_identitysearch.py
imports: from sympy.external import import_module
  from sympy.core.mul import Mul
  from sympy.core.numbers import Integer
  from sympy.physics.quantum.dagger import Dagger
  from sympy.physics.quantum.gate import X, Y, Z, H, CNOT, IdentityGate, CGate, PhaseGate, TGate
  from sympy.physics.quantum.identitysearch import generate_gate_rules, generate_equivalent_ids, GateIdentity, bfs_identity_search, is_scalar_sparse_matrix, is_scalar_nonsparse_matrix, is_degenerate, is_reducible
  from sympy.testing.pytest import skip
label_desc: Use image node_id 11 for calling a global function with example usage: test_bfs_identity_search_xfail() without return types